#include <libk/x86.h>

#define KBRD_INTRFC 0x64

/* keyboard interface bits */
#define KBRD_BIT_KDATA 0 /* keyboard data is in buffer (output buffer is empty) (bit 0) */
#define KBRD_BIT_UDATA 1 /* user data is in buffer (command buffer is empty) (bit 1) */

#define KBRD_IO 0x60 /* keyboard IO port */
#define KBRD_RESET 0xFE /* reset CPU command */

#define bit(n) (1<<(n)) /* Set bit n to 1 */

/* Check if bit n in flags is set */
#define check_flag(flags, n) ((flags) & bit(n))

void reboot()
{
	unsigned char temp;

	asm volatile ("CLI"); /* disable all interrupts */

		    /* Clear all keyboard buffers (output and command buffers) */
	do
	{
		temp = inb(KBRD_INTRFC); /* empty user data */
		if (check_flag(temp, KBRD_BIT_KDATA) != 0)
			inb(KBRD_IO); /* empty keyboard data */
	} while (check_flag(temp, KBRD_BIT_UDATA) != 0);

	outb(KBRD_INTRFC, KBRD_RESET); /* pulse CPU reset line */
	asm volatile ("HLT"); /* if that didn't work, halt the CPU */
}

